The Collaborative International Dictionary of English v.0.48:

Auriform \Au"ri*form\, a. [L. auris ear + -form.]
   Having the form of the human ear; ear-shaped.
   [1913 Webster]

WordNet (r) 3.0 (2006):

auriform
    adj 1: having a shape resembling an ear [syn: auriform, ear-
           shaped, ear-like]